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The Yaesu FT-221 is a modular VHF 2M all mode (SSB, AM, CW and FM) amateur radio transceiver, built by the Yaesu Corporation in Japan during the 1970s. ==Technical description== * Frequency Range 144.0 MHz ~ 148.0 MHz * Emission: AM FM SSB (LSB and USB) and CW * Power Output: :: * SSB 12 Watts PEP :: * FM, CW 14 Watts :: * AM 2.5 Watts 〔http://pdf.textfiles.com/manuals/SCANNERS-S-Z/Yaesu-FT-221%20Instruction%20Manual.pdf Yaesu FT-221 Instruction manual〕 The frequency is set by a 500 kHz range VFO being mixed with the product of a number of crystals and is displayed using a rotary display dial. The top of the case is removed by opening 4 quick release fasteners, revealing a number of user adjustable trimmers and pots. The modular design of the FT-221, where removable circuit boards allowed radio hams to modify their FT-221 either by replacing specific components or even replacing the whole board.〔http://www.radiomods.co.nz/yaesu/yaesuft221.html Modifications for the Yaesu FT-221 〕 One such replacement is the mutek replacement front end〔http://www.ssbusa.com/mutek.html mutek replacement front end〕 board which improved the front-end sensitivity. The open format of the internal construction also allowed the transmit and receive cables to be brought outside the case to use a low-noise coaxial relay. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Yaesu FT-221」の詳細全文を読む スポンサード リンク
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